To Face-Stalk (the act of Face-Stalking) involves a person (the Face-Stalker) obsessing over another person or people on Facebook. The Face-Stalker will spend hours reading wall posts, viewing photos and sifting through numerous status updates to gain as much information as possible about the person whilst never leaving any evidence that they have viewed the page. The Face-Stalker works incognito and will never write a comment on the victim's page or photos, as not to raise suspicion.

To "friend" someone on Facebook whom you haven't seen or talked to in years just to see what they look like, if they've gotten fat, have ugly kids, or otherwise see how their life sucks compared to yours. Also, you have no intention of ever writing on this person's wall or commenting on a status or picture, because you are just there to see what they look like/are doing now. Could also go the other way - they could totally rock and make you feel bad, in which case you will un-friend them.

You: Hey, I got an email from Kimmy from High School the other day.
Me: Really? You guys weren't even friends though, right?
You: Hmmm, I guess not.
Me: Dude, she is totally facestalking you.

To browse Facebook users' profiles constantly without their knowing, especially when they are not your friends and you are judging them as you do it.

Katie: "Hey you wouldn't believe who added me on Facebook, Fre-."
Michelle: "Fred Thomas, I know, and he commented your pictures."
Katie: "Hey, how did you know?"
Michelle: "Oh, I was just FaceStalking last night."